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- W2512204583 abstract "Energy spread ..delta..E and brightness B are the two important parameters for defining electron beam quality. An attempt in this paper for three types of generally used thermionic cathodes (hairpin, pointed and LaB6) and three particular Wehnelt shapes (re-entrant, flat and conical) has been made. It has been demonstrated that the energy spread is much more dependent on brightness than on total emitted current; for a given brightness the best gun is the one that gives smaller total emitted current. One can expect with pointed and LaB6 filaments when compared with hairpin filament at a given constant energy spread, the brightness increases by about 2 to 3 times. Higher brightness is obtained simultaneously with larger energy spread: for example, at 20 kV, the maximum brightness and corresponding energy spread of a pointed and a hairpin filament mounted in a flat Wehnelt are B = 4x10/sup 5/ Acm/sup -2/ sr/sup -1/, ..delta..E = 3.3 eV and B = 6 x 10/sup 4/ Acm/sup -2/ sr/sup -1/, ..delta..E = 2 eV respectively." @default.
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- W2512204583 date "1987-10-01" @default.
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- W2512204583 title "Energy spread of different electron beams. I: Thermoionic electron beams" @default.
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